Bearing device

Abstract

A bearing including an inner ring, an outer ring, and a plurality of rolling elements arranged between the inner ring and the outer ring, the inner ring including an annular portion and an extension portion protruding in an axial direction from an end surface of the annular portion on a radially inner side and having a slit formed in the axial direction; and a clamping member that is externally fitted to the extension portion, and is configured to clamp and fix the extension portion to a shaft. A radially inner end portion of the clamping member on a bearing side is provided with a stepped portion to which a radially outer end portion of the annular portion is allowed to be fitted.

1 . A bearing device, comprising: 
 a bearing comprising an inner ring, an outer ring, and a plurality of rolling elements arranged between the inner ring and the outer ring,   the inner ring comprising an annular portion, and an extension portion protruding in an axial direction from an end surface of the annular portion on a radially inner side and having a slit formed in the axial direction; and   a clamping member that is externally fitted to the extension portion, and is configured to clamp and fix the extension portion to a shaft,   wherein a radially inner end portion of the clamping member on a bearing side is provided with a stepped portion to which a radially outer end portion of the annular portion is allowed to be fitted.   
     
     
         2 . The bearing device according to  claim 1 , wherein a thickness of the extension portion in a radial direction is smaller than a maximum thickness of the annular portion in the radial direction. 
     
     
         3 . The bearing device according to  claim 1 , wherein an axial depth of the stepped portion is equal to or larger than an axial dimension of a chamfer formed on the radially outer end portion of the annular portion. 
     
     
         4 . The bearing device according to  claim 1 , wherein a clearance in the radial direction between a radially inner surface of the clamping member in the stepped portion and the radially outer end portion of the annular portion is larger than a clearance between the radially inner surface of the clamping member and a radially outer surface of the extension portion. 
     
     
         5 . The bearing device according to  claim 1 , wherein an opening is formed in the extension portion. 
     
     
         6 . The bearing device according to  claim 1 , wherein an outer peripheral surface of the outer ring is provided in a bearing housing so as to be allowed to be aligned with the bearing housing.